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Since 2007 ... We stand behind our Non-OEM products, manufactured under ISO 9001 certifications. 100% satisfaction or you may return your purchase to us within 6 months of purchase for a replacement or exchange, free of charge. OEM Products come with a manufacturer warranty only.

When do I Replace a Transfer Belt in the Brother HL-4070CDW Laser Printer?

The useful life of the transfer belt is approx. 50,000 pages at 5% coverage. You can check the life counter of the transfer belt by selecting [Machine Info] – [Parts Life] – [Belt Life]. The installed transfer belt must be replaced in the following circumstances:

The message [No Belt Unit] is displayed – An absence of a transfer belt has been detected. Please make sure that the transfer belt is installed correctly. A new transfer belt must be installed if the problem persists.

The message [Registration <> Registration Failed] is displayed – The Brother HL-4070CDW Laser Printer has detected a hardware problem. You should try to solve the problem by turning the laser printer off, and then back on. Please replace the installed transfer belt if the problem persists.

The message [Change Belt Unit] is displayed – The printing resource of the installed transfer belt has been exhausted. Please install a new transfer belt.

Incorrect/inaccurate colors

Blurred printouts

How to Install a Transfer Belt in the Brother HL-4070CDW Laser Printer

You must make sure that the Brother HL-4070CDW Laser Printer is switched off, and then open the front cover. Next, you must lift the drum unit approx. 2inches up and then pull it towards you until it stops. After that, you must unlock the drum unit by pulling the grey lever up, and then take the drum unit along with the installed toner cartridges out of the laser printer. Now, you must lift the exhausted transfer belt up, and then pull it towards you to remove it. In the next step of the replacement procedure, you must remove the protective cover and paper from the new transfer belt, and then insert the new component into the machine. Once the new transfer belt is inserted, you must lock it into place by pressing its green front side down, and then reinstall the drum unit. Next, you must close the front cover, and then turn the Brother HL-4070CDW Laser Printer on. Finally, you must reset the transfer belt counter by selecting [Machine Info] – [Reset Parts Life] – [Belt Unit].

When do I Replace a Front Door Assembly in the Brother HL-4070CDW Laser Printer?

You should replace the front door assembly in the following circumstances:

The error code [9A <> Manual Feed] is displayed – You must make sure that the paper loaded into the input tray is enough. Then, you must make sure that the harness connection of the MP PE/sensor PCB assembly is correctly inserted. Please replace the front door assembly if the problem persists.

The error code [A1 <> Cover is Open] is displayed – You should open and then close the front door. Please replace the front door assembly if the problem persists. The complete replacement procedure is included below.

How to Install a Front Door Assembly in the Brother HL-4070CDW Laser Printer

Initially, you must detach the earth wire of the front door assembly from the main frame by removing the mounting screw, and then unplug the six connectors from the Engine PCB assembly. After that, you must remove the retaining ring from the wire support rope of the front door assembly, and then release the wire support strap by pulling it away from the shaft of the frame unit. Now, you must remove the collar from the left hinge shaft of the front door assembly, and then detach the left hinge shaft from the left hinge plate. In the next step of the replacement procedure, you must remove the collar from the right hinge shaft of the front door assembly, and then remove the right hinge shaft from the right hinge plate. Finally, you must remove the front door assembly from the Brother HL-4070CDW Laser Printer, and then install the replacement component by executing the current procedure in reverse order.

When do I Replace a Laser Unit in the Brother HL-4070CDW Laser Printer?

The approximate life of the laser unit is 100,000 pages. You must replace the laser unit installed in your Brother HL-4070CDW Laser Printer in the following circumstances:

The status message [Laser Unit End] is displayed – More than 100,000 pages have been printed since the installation of the laser unit. You must replace the installed laser unit with a new one.

The error message [Print Unable 23] is displayed – The Brother HL-4070CDW Laser Printer failed initializing the laser unit. You should reconnect the two harness connections of the laser unit, restart the laser printer, and then try to print. Please install a new laser unit if the problem persists.

The error message [Print Unable 73] is displayed – You must make sure that the laser unit is installed correctly. After that, you should turn the Brother HL-4070CDW Laser Printer off and then back on. Please install a new laser unit if the problem persists.

The error message [Print Unable EB] is displayed – The Brother HL-4070CDW Laser Printer has detected an NVRAM reading error on the laser unit. You should turn the laser printer off and then back on. You must replace the installed laser unit if the problem persists.

Image Distortion – You must make sure that the laser unit is installed correctly. Please replace the installed laser unit if the problem persists.

Faint print – You must make sure that the Brother HL-4070CDW Laser Printer is leveled. After that, you should replace the toner cartridge, and then clean the scanner windows. You will have to replace the installed laser unit if the problem persists.

How to Install a Laser Unit in the Brother HL-4070CDW Laser Printer

In the initial step of the replacement procedure, you must switch the Brother HL-4070CDW Laser Printer off, and then unplug the power cord. Next, you must open the front door, and then open the back cover. After that, you must detach the upper back cover by removing the two screws, and then remove the screws from the hinges of the back cover assembly. Now, you must remove the back cover assembly from the main unit, and then detach the left side cover assembly by removing the four screws and releasing the five hooks. In the next step of the replacement procedure, you must remove the right side cover assembly, and then remove the top cover assembly by releasing its hooks and removing the mounting screws. Once the top cover assembly is removed, you must unplug the connector of the wireless LAN PCB Assembly, and then detach the hook slopes by removing their fixing screws. Next, you must detach the scanner cover by removing the ten screws, and then unplug the two flat cables and the connector from the exhausted laser unit. After that, you must remove the seven screws, which secure the exhausted laser unit to the main frame, and then remove the four scanner holders. Now, you must take the exhausted laser unit out of the Brother HL-4070CDW Laser Printer, and then install the replacement component by executing the current procedure in reverse order. Finally, you must turn the machine on, and then reset the laser unit counter by: